A union ballot has been ruled illegitimate because of minor failings in the way the result was reported. The result itself was not questionned. The legitimacy of the mandate for strike action was not questionned. Rather, the reporting of the number of spoiled ballots was the cause for concern!
Imagine such stringent rules applied to the UK general election, or any other election for that matter. How many fraudulent votes are there? We know some people were unable to vote this time because there were problems at some polling stations when turnout reached unexpected levels. It seems that unions are now routinely criticised for much less – the equvalent of the Returning Officer coughing during the announcement of the results. We should re-run the election on the same basis.